Functional completeness: Difference between revisions
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In [[mathematics]], the '''Fulton–Hansen connectedness theorem''' is a result from [[intersection theory]] in [[algebraic geometry]], for the case of [[subvarieties]] of [[projective space]] with [[codimension]] large enough to make the intersection have components of dimension at least 1. | |||
The formal statement is that if ''V'' and ''W'' are irreducible algebraic subvarieties of a [[projective space]] ''P'', all over an [[algebraically closed field]], and if | |||
: dim(''V'') + dim (''W'') > dim (''P'') | |||
in terms of the [[dimension of an algebraic variety]], then the intersection ''U'' of ''V'' and ''W'' is [[connected space|connected]]. | |||
More generally, the theorem states that if <math>Z</math> is a projective variety and <math>f:Z \to P^n \times P^n</math> is any morphism such that <math>\dim f(Z) > n</math>, then <math>f^{-1}\Delta</math> is connected, where <math>\Delta</math> is the [[diagonal]] in <math>P^n \times P^n</math>. The special case of intersections is recovered by taking <math>Z = V \times W</math>, with <math>f</math> the natural inclusion. | |||
==See also== | |||
* [[Zariski's connectedness theorem]] | |||
* [[Grothendieck's connectedness theorem]] | |||
* [[Deligne's connectedness theorem]] | |||
==References== | |||
* {{citation|first=W.|last= Fulton|first2= J. |last2=Hansen|title=A connectedness theorem for projective varieties with applications to intersections and singularities of mappings|journal= Annals of Math. |volume=110 |year=1979|pages= 159–166|doi=10.2307/1971249|jstor=1971249|issue=1|publisher=Annals of Mathematics}} | |||
* {{citation|first=R.|last= Lazarsfeld|title=Positivity in Algebraic Geometry|publisher= Springer|year= 2004}} | |||
==External links== | |||
* [http://www.math.unizh.ch/fileadmin/math/preprints/20-05.pdf PDF lectures withe the result as Theorem 15.3 (attributed to Faltings, also)] | |||
{{DEFAULTSORT:Fulton-Hansen connectedness theorem}} | |||
[[Category:Intersection theory]] | |||
[[Category:Theorems in algebraic geometry]] |
Revision as of 19:56, 31 October 2013
In mathematics, the Fulton–Hansen connectedness theorem is a result from intersection theory in algebraic geometry, for the case of subvarieties of projective space with codimension large enough to make the intersection have components of dimension at least 1.
The formal statement is that if V and W are irreducible algebraic subvarieties of a projective space P, all over an algebraically closed field, and if
- dim(V) + dim (W) > dim (P)
in terms of the dimension of an algebraic variety, then the intersection U of V and W is connected.
More generally, the theorem states that if is a projective variety and is any morphism such that , then is connected, where is the diagonal in . The special case of intersections is recovered by taking , with the natural inclusion.
See also
- Zariski's connectedness theorem
- Grothendieck's connectedness theorem
- Deligne's connectedness theorem
References
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